with marvin kalb and his daughter deborah kalb. they have written a book about the legacy of vietnam called "haunting legacy." >> one of the most difficult things about "haunting legacy," charlie, is to try to understand what is it that presidents go through when they make major decisions about war and ace? these are human beingsnd they have fears andin obama's mind, not only the first black president in american hiory and that's on his min too is something that he cannot be careless about. >> we start withresidentord as the war wa ending and we do chapter on each president up president obama and eac president was affected by that war in terms of both his personal life, his experiences, his politics in terms of the campaign and primarily his foreign policy decision making. >> rose: wcontinue this evening with david wise, who's written another book about espionage. it's about chinese and american espionage and it's called "tiger trap." >> the chinese spy very differently than, for example, the k.g.b., or now the s.b.i., as it's called. the chinese have been at this much longer than we have.